H e e p analysis
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H(e,e’p) Analysis. Chris Crawford Blast Analysis Meeting 2004/05/21. Monte Carlo Dataset. used DGen, epel channel KINE 10 1. 1. 0. 45. 0. 21. 0. 11. (note .’s) 4 states, q =25 ±  90 ± , f =-17 ±  17 ± gen. 2.5M events ! 1.5M recon (75 bud hrs) momentum resolution: 15 MeV

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H(e,e’p) Analysis

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H e e p analysis

H(e,e’p) Analysis

Chris Crawford

Blast Analysis Meeting

2004/05/21


Monte carlo dataset

Monte Carlo Dataset

  • used DGen, epel channel

    • KINE 10 1. 1. 0. 45. 0. 21. 0. 11. (note .’s)

    • 4 states, q=25±  90±, f=-17±  17±

    • gen. 2.5M events ! 1.5M recon (75 bud hrs)

  • momentum resolution: 15 MeV

    • 6th order t2d function (before 2ndq bug-fix)

    • standard wire resolution (200!120!400 m)

    • LOSS=1 MULS=1


Mc cross section

MC Cross Section

theta


Mc asymmetry

MC Asymmetry


Mc form factor ratio

MC Form Factor Ratio


Fit method

Super-ratio Method

2 equations in P, R

for fixed bin j

independent polarization in each bin!

2n parameters Pj, Rj

Global Fit Method

fit ALj, ARj to above formalism with P, Rj

n+1 parameters

n+2 (+spin angle?)

same advantage as super-ratio method

PbPt still cancels

i = left,right

j = Q2 bin (1..n)

b = spin angle

Fit Method


Outbending data dec

Outbending Data (Dec)


Inbending data feb apr

Inbending Data(Feb, Apr)


Combined dataset

Combined Dataset


Fit of spin angle

Fit of Spin Angle

  • Spin angle: 35±§ 10±(errors also insensitive?)


Systematic errors

Systematic Errors

  • 4 measured states ) 2 False Asymmetries

  • Two options:

    • a) assume beam and target symmetric, use Ab, At to estimate uncertainty in charge

    • b) use measured beam/target asymmetryto calculation physics asymmetry dilution


False asymmetries

False Asymmetries


Mc resolution studies

MC Resolution Studies

intrinsic wire resolution

Momentum Resolution (MeV)


Track fit data vs mc

Track Fit Data vs MC


Tools for improving reconstruction analysis

wcb_ntuple.C

entry for each stub

track info (p,q,f,z)

stub coordinates

t0-2, x0-2, d0-2

qtrk in cell, B field

Tools for Improving Reconstruction/Analysis


Nsed init c

nsed + init.C


Cosmics

Cosmics


Todo list

Todo List

  • refine cuts (TOF, CC), subtract background

  • cuts on epics variables (current, WC HV)

  • detector efficiencies w/unpol buffer system

  • more statistics in MC, radiative corrections

  • unfold b(z), acceptance dependence of s

  • improve WC resolution, do a kinematic fit

  • investigate low value of b fit


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